Covalently Linked Heterobimetallic Catalysts for Olefin Polymerization

摘要

Summary:This contribution describes the synthesis and polymerization characteristics of the covalently linked heterobinuclear constrained-geometry polymerization catalyst (mu-CH_2CH_2-3,3'){(eta~5-indenyl)[l-Me_2Si(~tBuN)]-(TiMe_2)}{(eta5-indenyl)[1-Me_2Si(~tBuN)](ZrMe_2)}(Ti_1Zr_1).When activated with Ph_3C~+B(C_6F_5)~4,it is competent to produce long-chain (>=C_6) branched polyethylenes in ethylene homopolymerization,in sharp contrast to control experiments with mixtures of analogous but mono-nuclear Zr and Ti CGC catalysts.